Commodore are writing their own Operating System, they just haven't finished it yet:
http://www.commodoreusa.net/CUSA_C64.aspx
Play all your favorite 8-bit era games within seconds of turning the Commodore 64 on, by either selecting the C64 icon from the boot menu to run a C64 emulator directly, or from a media center program within our own Commodore Operating System.
Note: Commodore OS 1.0, along with emulation functionality and classic game package, will be mailed to purchasers when available. In the meantime, units come with the Ubuntu 10.04 LTS operating system on CD ready to install.
And
http://www.commodoreusa.net/CUSA_OS.aspx
I'm looking forward to seeing the OS in action. I won't be getting the C64 but I'm looking forward to the Amiga. The real test will be the support it gets from third party developers.